TN8044AH-R0117 datasheet(42/65 Pages) INNOVASIC

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IA8044/IA8344

Data Sheet

SDLC Communications Controller

March 30, 2010

IA211010112-04

http://www.Innovasic.com

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Page 42 of 65

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Table 42. Receive Control Byte Register

RCB.7

RCB.6

RCB.5

RCB.4

RCB.3

RCB.2

RCB.1

RCB.0

4.10.13 DMA Count Register (DMA CNT)

Table 43 presents the DMA Count Register (DMA CNT), which contains the number of bytes

remaining for the information field currently being used. This register is an ICE support register.

DMA CNT is byte addressable.

Table 43. DMA Count Register (DMA CNT)

DMA

CNT.7

DMA

CNT.6

DMA

CNT.5

DMA

CNT.4

DMA

CNT.3

DMA

CNT.2

DMA

CNT.1

DMA

CNT.0

4.10.14 DMA Count Register (FIFO)

Table 44 presents the DMA Count Register (FIFO), which is actually three registers that make a

three-byte FIFO. These are used as temporary storage between the eight-bit shift register and the

receive buffer when an information field is received. This register is an ICE support register.

FIFO is byte addressable.

Table 44. DMA Count Register (FIFO)

FIFO#a.7

FIFO#a.6

FIFO#a.5

FIFO#a.4

FIFO#a.3

FIFO#a.2

FIFO#a.1

FIFO#a.0

a1, 2, or 3 for FIFO1, FIFO2, or FIFO3, respectively.

4.10.15 SIU State Counter (SIUST)

Table 45 presents the SIU State Counter Register, which indicates what state the SIU state

machine is currently in. This in turn indicates what task the SIU is performing or which field is

expected next by the SIU. This register should not be written to. This register is an ICE support

Table 45. SIU State Counter

SIUST .7

SIUST .6

SIUST .5

SIUST .4

SIUST .3

SIUST .2

SIUST .1

SIUST .0

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